Dear Dreperales I am sorry to hear about your son. I gathered your son got to use catheter but you have not mensioned why. How ever oathetr can cause bleeding and infection. I feel that the cause of his problem. I strongly suggest to take him to the specialist for through physical examination, including cystoscopy
(special examination of bladder) sending urine for culture and sensitivity and will prescribe appropriate antibiotcs. Your son may need surgical treatment
depending on diagnosis. Kindest regards SKMukherjee.